Rapid Reinstatement of Daye Special Steel No.1 BF from Long-term Unscheduled Blow-down
No.1 BF of Daye Special Steel is blow-down for 64h 20min due to failure of the top transmission gearbox.To rein-state the furnace condition rapidly,the furnace temperature is preserved in blow-down period,and are blow-in scheme is formulated based on the concept of rapidly heating the hearth and fully discharging hot metal heel and slag considering the furnace situation of long-term blow-down,no blow-downstock,heavy furnace load,and great heat loss of the hearth.Before reblow-in,the hot stove is switched to combustion mode in advance;and after reblow-in,the blast temperature is increased rapidly,accompanied by timely injection of pulverized coal,charging of coke,accurate control of thepaces of blasting,oxy-gen enrichment and tuyere opening,and timely discharge of the cold slag and hot metal heel according to the tapping situa-tion.As a result,the furnace steps to full blast operation and resume its normal production only 8hours and 12hours respec-tively after reblow-in.
blast furnaceunscheduled blown-downtemperature preservationreblow-inheat of hearth
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